Changed how icons are started. Previously, ede-desktop would extract content from .desktop Exec key and explicitly run it. This would not correctly handle other .desktop details, like startup notification or running in terminal. Now, full .desktop path is sent directly to ede-launch which will take care about named startup details.
These changes also fixes bug #235: "Working directory and startup notification for desktop icons".
Imported new and functional ede-dialog.
ede-help uses ede-dialog for error reports; xmessage is not used since some OS-es to not install it
by default, e.g. OpenSolaris.
Removed obsolete ede-tip.conf.
Fixed background issue in ede-tip; background will now always be white so it can nicely blend with the image.
Commit fixed ede.desktop.in; previous commit was only renaming without content change.
Reduce some debug output in ede-autostart.
